I've gone through DT770 250 ohms (needs a good amp), Grado 325i's (very close to Axiom sound), Shure 840's and Grado HF2's. I LOVE my HF2's and the 840's were a great value at $130. I sold the first 2 and kept the last 2.
Open headphones aren't the best if you want it quiet for others. Unless you are willing to spend a lot of time doing return shipping, your best bet is to try as many before you buy. If you're lucky, you might find a local headphone meet on headfi. They had one in my area and I got to demo MANY headphones w/ different sources and amps. It's a pretty doable kind of equipment meet because they aren't as big as speakers.
